Controller.



i. DEUTSCH.

CONTROLLER.

APPLICATION FILED MAR. 7. i913- 1,244,478. Patented 001;. 30,1917.

2 SHEETS-SHEET I.

Fiql.

INVENTOH ZATTORNEY l. DEU'TSCH.

CONTROLLER.

APPLICATION man MAR. I, 1913.

1,244,478. Patented Oct. 30, 1917.

2 SHEETSSHEET 2.

7. 'ATTORNEY UNITED STATES PATENT onrron.

ISIDOR DEUTSCH, OF AVALON, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEC-TRIO AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

CONTROLLER.

Specification of Letters Patent.

Patented Oct. 30, 1917.

Application filed March 7, 1913. Serial No. 752,637.

To all whom it may concern:

Be it known that I, ISIDOR DEUTSCH, a citizen of the United States, anda resident of Avalon,'in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Controllers,of which the following is a specification.

My invention relates to controllers of the drum type for electric motorsand it has for its object to provide a simple and practical structure inwhich the armature and field resistors are mounted inside or upon thecontroller drum.

In the usual type of controllers, the field and armature resistors areplaced outside the controller structure. This construction necessitatesa multiplicity of both contact members and leads between the resistorsand contact members.

In my invention, I propose to use a drum, the body of whichis composedof cement or other insulating material and which supports the armatureand field resistors either upon its exterior surface or within openingsor tubes.

In the drawings, Figure 1 is a side view, partly in section, of thecontroller. Fig. 2 is an end view of the drum partly in section. Fig. 3is a diagram of the connections. Fig. 1 is a detail View of the contactmembers connected to the field resistor. Fig. 5 is a detail view showingthe method of connecting certain of the contact members to the armatureresistor. i

The drum comprises acylindrical body 1 supported by a shaft 2 which hasa bearing 3 in one end of a casing 4 and a bearing 5 in the cover 6 ofthe casing. A handle 7 serves to rotate the shaft and drum. The body ofthe drum is composed of cement or other suitable insulating material inwhich are. openings or tubes 9,.in each of which are mounted thearmature resistor units in pairs. In the preferred form, the units arecomposed of porcelain tubes 10 supported by bolts 11 passing throughplates 8, with wash ers 12 between the bolts and the tubes. Theresistance material, which is preferably nichrome wire, is wound uponthe exteriors of the tubes. The members of each pair of units are inseries, while the terminals of the pairs are connected to bars 14embedded in the body 1, as shown in Fig. 5, which are connected to fourpairs of contact pieces 15 on the outer surface by bolts 01' screws 16.The contact pieces are thus connected to divide the resistor into fourapproximately equal parts, each composed of a pair of units. At theopposite end of the drum are mounted the units of the field resistor 17.In the form shown, tubes 18 composed of insulating material, containcylinders 19, also of insulating material, upon which are wound theresistance wire 20. The tubes are connected to the body of the drum bybolts or screws 21 connected with five pairs of contact pieces 22, asshown in detail in Fig. 1, the wire 20 being connected to the bolts 21.As diagrammatically shown in Fig. 3, the field resistor is divided intofive approximately equal parts by the points connected to the contactpieces.

Between the row of contact pieces 15 connected to the armature resistorand the row of contact pieces 22 connected to the field resistor, arecontact strips 23, 24 and 25 which are fastened to the body 1 by screws26 and are arranged to coact with contact fingers 27, 28 and 29,respectively. The contact pieces 15 are alined with contact strips 30,and the contact pieces 22 are alined with contact strips 31, whichengage contact fingers 32 and 33, respectively, during the rotation ofthe drum. The contact finger 32 is connected to the negative side of theline, while the finger 29 is connected, through the series field winding31 of the motor 35, to the positive side of the line. The finger 27 isconnected to one terminal of the motor and to the shunt field winding 36of the motor, vhile the contact fingers 28 and 33 are connected, by acommon lead, to the other motor terminal. Four leads 37 extend from thedrum to the motor through an insulated opening 38 in the casing 4 tomake the connec'tions above described. The contactor pieces and contactstrips are mounted on ribs 39 formed on the periphery of the drum. Anarc shield 40 is placed between the contact fingers 32 and 27.

The operation of the device is as follows: When the handle is rotated ineither direc tion, for example, to the left, from the cen tral or 011position, and the several contact fingers are engaged by the first ofthe contact pieces 15 and the several contact strips, the electricalconnections of the motor are made. A circuit will be established fromthe negative side of the line through the finger 32, first contact piece15, through armature resistor 13, strip 24, finger 28,the armature ofthe motor 35, finger 27, strip 23, strip 25, finger 29, through theseries field winding 34: to the positive side of the line. The shuntfield circuit is established from the fixed connection 41, through theshunt field Winding 36 to contact strip 31 and finger 33, to the otherterminal of the motor. \Vhen the drum is rotated farther in the samedirection, the armature resistor is first gradually cut out, as thecontact pieces 15 are engaged in succession by finger 32 and, when thefinger engages the strip 30, the armature resistor will have beenentirely cut out. As the controller handle is moved farther toward therunning position, the finger 33, which has been in contact with thestrip 31, will then be engaged in succession by the contact pieces 22and the field resistor 20 will be gradually inserted in series with theshunt field winding. The position for maximum speedwill, of course, beat the end of the travel or when the en tire resistor 20 has beeninserted to weaken the field. When the operator desires to stop themotor, and the handle is moved from the maximum-speed position to theoff position, the reverse operation will take place. The field resistorwill be gradually cut outand,after that operation has been completed,the contact finger 32- Will be successively engaged by the contactpieces 15, again inserting the armature resistor in series with the lineand bringing the motor to a gradual stop. \Vhen the handle is rotated tothe right, the connections reverse the direction of rotation of themotor but the sequence of operation is the same. 7

Simplicity is one of the advantages of this construction, since themultiplicity of leads and contact members, such as is found in the usualconstruction, is avoided. The resistor units can be easily removed forrepair or examination. There is also an economy of space, since theyresistors are placed in a space which could be used for no other purose.

p It will be understood that this type of drum is adapted especially tomotors of small size. For motors of over 25 H. P., a grid resistor willprobably be required which could not, of course, be placed in the drum.

While I have described the preferred form of my invention and specifiedthe materials which I prefer to use, it- :is understood that Lmay useany other materials which perform the :same functions. Vhile I have inifiorm of tubes or cylinders, it is understood that the resistancematerial may be wound in any other suitable manner. Various otherchanges may be made Within the scope of the appended claims.

As shown,thc armature resistor is in four parts, each part wound on twoporcelain cylinders mounted in the same opening or tube 9 in the drum.This arrangement is illustrative only, as any other grouping of theresistor units may be used, as re quired. The field resistor may beembedded in the cement or placed in tubes as desired.

I claim as my invention:

1. A. controller drum comprising a body portion of molded material, aresistor inclosed by said molded material but detachable therefrom,contact, members mounted on said body portion and connected to saidresistor, and means for rotating said drum.-

2. A controller drum comprising a body portion of insulating materialhavm openings, resistors detachably mounted in said openings, andcontact members mounted on said body portion and connected to saidresistors.

3. A controller drum comprising a body portion having recesses, anarmature resistor in said recesses, a field resistor for an elec-v tricmotor supported by said body porti contact members on said body portion,an connecting means for said resistors and saidmembers embedded in saidbody portion.

l. In a controller drum, the combinationwith a cylindrical body portionof insulwting material having openings, and an armature resistor in saidopenings, of a field resistor supported by said body portion, andcontact members connected to said resistors.

5. In a controller, the combination with a cylindrical drum having abody portion of insulating material having recesses, armature and fieldresistors for an electric motor supported by said body portion, one ofsaid .resistorsbeing mounted in said recesses, and annular ribs on saidbody portion, of contact members on said ribs, means for connecting saidresistors and said contact members, and contact fingers for engagingsaid contact members.

6. A controller comprising a rotatable body portion of insulatingmaterial having longitudinally extending recesses, resistor unitsmounted in said recesses and detachably connected to said body portionand contact members carried by said body portion and connected to saidresistors.

7. A controller comprising a rotatable having recesses, resistor unitsmounted in subscribed my name this 26th day of Febsaid recesses andspaced from the sldes of ruary 1913. the recesses, means for detachablyconnecting said resistors to said body portion, and con- ISIDOR DEUTSCH'tact members electrically connected to said Witnesses:

resistor. E. L. ZUoK,

In testimony whereof, I have hereunto B. B. HINES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

